What does x equal if 2.3-5x=3x-5.7 and can you explain how to do this ?

Julie buys 2kg of apples and 7kg of pears ? 12.70. the pears cost ? 1.30 per kilogram what is the price per kilogram of the apples? show your working out

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If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if